EFFECT OF DESICCANT CHARACTERISTICS ON THE PROPERTIES OF PS/ZEOLITE FUNCTIONAL PACKAGING MATERIALS

Kenyó, Csaba and Renner, Károly and Móczó, János and Bódiné Fekete, Erika and Kröhnke, Christoph and Pukánszky, Béla (2014) EFFECT OF DESICCANT CHARACTERISTICS ON THE PROPERTIES OF PS/ZEOLITE FUNCTIONAL PACKAGING MATERIALS. Polymer Composites, 35 (11). pp. 2112-2120. ISSN 1548-0569

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Abstract

Desiccant composites were prepared from a polystyrene homopolymer (PS) and a high impact copolymer (HIPS). Five zeolites were used as adsorbents which included the A and X types frequently used in industrial practice. Composites containing zeolites up to 50 vol% were homogenized in an internal mixer and then compression molded to 1 mm thick plates. The results proved that the water adsorption capacity of zeolites depends on the total volume of the pores, while the rate of adsorption on thermodynamics, on the equilibrium con-stant of adsorption. On the other hand, zeolite characteristics influence the moisture ad-sorption of the composites only marginally; adsorption capacity is determined by zeolite content, while the rate of adsorption by the properties of the polymer. Composites prepared with X type zeolites have somewhat smaller water adsorption capacity than those containing their A type counterparts. The dispersion of the zeolite is very good both in PS and in HIPS composites. Mechanical properties are excellent mainly because of the good interfacial adhesion between the components. Because of their larger surface energy, composites containing X type zeolites have larger viscosity and they reinforce the polymer more than A type desiccants. Matrix properties influence mainly application related properties, reinforcement and ductility is better in HIPS than in PS composites.

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